Question

Foldings of inner mitochondrial membrane are called

• A. Grana
• B. Thylakoids
• C. Cristae
• D. $F_0-F_1$ structures

Answer 1

Answer: (C)

Cristae

• The mitochondria is a double-membraned cell organelle, known as the powerhouse of the cell which is present in all eukaryotic cells.
  
• It has an outer membrane and an inner membrane.
  
• The inner mitochondrial membrane has folds called cristae which helps in increasing the surface area.
• The enzyme ATP synthase is embedded in the inner mitochondrial membrane helps in the synthesis of ATP molecule (energy currency of the cell).
  
• It is also the site of the electron transport chain (aerobic respiration).
  
• So, the correct answer is 'Cristae'.